Centering-machine.



W. B. JOHNSON. GBNTBRING MACHINE. APPLICATION FILED APR". 3, 1908.

959,865. Patented May 31, 1910.

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UM an M 1%: (141W ANDREW B. GRAHAM c0 FHOTO-UTHDGRAPHERS. WASHINGTON D.c.

UNITE STATES OFFICE.

WILLIAM B. JOHNSON, OF ROCKFORD, ILLINOIS, ASSIGNOR TO ROCKFORD LATHE &DRILL COMPANY, OF ROCKFORD, ILLINOIS, A CORPORATION OF ILLINOIS.

CENTEBING-MACHINE.

To all whom it may concern:

Be it known that I, WILLIAM B. JOHNSON, a citizen of the United States,residing at Rockford, in the county of Winnebago and State of Illinois,have invented certain new and useful Improvements in Centering-Mmchines, of which the following is a specification.

The object of this invention is to construct a machine for centering theends of shafts, and holding the shafts in a vertical position whilebeing centered.

In the accompanying drawings Figure 1 is a side elevation of my improvedcentering machine. Fig. 2 is a front elevation. Fig. 3 shows the pivotalconnection of the table.

The main frame comprises the base 1, vertical column 2 and overhanginghead The column has two vertically arranged guide-ways 1 and 5 betweenwhich the section of the column 6 is rounded. The rounded section 6 ofthe column supports a collar 7 to which is pivoted a table 8 which iscapable of being adjusted into a vertical position through the medium ofthe slot 31 and the adjusting bolt 32, as shown at Fig. 3 in thedrawings. To this table is secured a universal vise comprising the twojaws 9 which are adjusted toward and from one another by the right andleft handed screw 10 which is turned by the crank 11. This vise issecured to the table by the upper overhanging portion 12 engaging theedge 13 of the table and the screw 14: clamping it to the table.

The guide-way at supports an arm 15, the free end of which supports asleeve 16, through which a drill spindle 17 passes. This drill spindleis also supported by the head 3, and a pulley 18 supported by the head,has a driving connection with the drill spindle 17. This arm 15 isadjusted along the guide-way 4 to bring the tool 19 sup ported by thedrill-spindle in proper relation with the table.

The guide-way 5 supports a bracket 20, the free end of which has avertical hole 21. The bracket 20 supports a rest for the lower end of ashaft. This rest comprises a base 22 having a rounded section 23 fittedto enter the hole 21 in the bracket 20. The

Specification of Letters Patent.

Application filed April 3, 1908.

Patented May 31, 1910.

Serial No. 424,911.

j upper end of this base is in fork form, be-

tween the branches of which is pivoted a spider farm comprising thepointed section 24, the cup section 25 and the forked section 26. Anyone of these sections can be held in a vertical position by turning thespider and inserting the pin 27 in one of the holes 28 in the spider.

The collar 7 supporting the table 8 is turned to bring the center of thevise beneath the center of the tool, which is indicated by the marks 29on the column, and collar.

If the shaft 30 to be centered has one end already centered, thecentered end is placed on the point 2 1 of the rest. The shaft is thenclamped in the vise which will hold the shaft in perfect alinement withits rest, and the tool 19. The tool 19 is then lowered onto the upperend of the shaft and set in rotation which will drill a center in theshaft. If the shaft does not have a centered lower end, the cup 25 ofthe spider is brought into a vertical position, into which the lower endof the shaft is placed, and which, owing to its cone-shape will supportthe shaft centrally'beneath the vise.

The vertical adjustment of the arm 15 and bracket 20, will receiveshafts of various lengths.

This construction forms a very simple, cheap and efficient centeringdevice.

The fork 26 of the splder is intended when turned into a verticalposition to receive a section of shafting which has its end beveled.

I claim as my invention.

A centering machine comprising a vertically arranged column, avertically arranged drill-spindle, a table capable of adjustment into avertical position, and a universal vise secured to the table inalinement with the drill-spindle.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

WVILLIAM B. JOHNSON.

Witnesses:

A. O. BEHEL, E. D. E. N. BEHEL.

